Here you can edit the visibility options: set the trail length and trail visibility.
Take a snapshot of the screen.
Create a new system set the number of planets and choose system type.
tap to select a planet then pinch to increase it's radius
set radius and density then tap to add a new planet to the system
pan the view with a 2 finger drag
touch and drag with one finger to rotate the system
pinch to zoom in and out of the system
touch and drag a planet
flick a planet to give it a new velocity
pinch on a selected planet to increase it's radius
depending on tool selection: tap to select, add, remove or follow planet
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